Use of a Theoretical Flow Model to Correlate Data for Film Cooling or Heating an Adiabatic Wall by Tangential Injection of Gases of Different Fluid Properties

Abstract

An equation is derived, by use of a simplified theoretical flow model, that predicts the temperature of a film-cooled wnll within 5% for a range of cooling effectiveness from approximately 0.2 to 1.0. The equation is easily solved for required coolant flow rate by a simple iteration process involving continuity. Both helium and air were used as the coolant gas. The range of variables covered by the data is as follows: main-gas-stream temperature, 502 to 1965 deg R: main-gas-stream velcoity, 104 to 1040 ft/sec; velocity natio V/sub g/ /V/sub c/, 0.45 to 33.3; injected gas temperature, 530 to 980 deg R; and coolant slot height, 0.063 to 0.50 inch. (auth)